Double-operation type straight stroke spring type valve actuator

Abstract

The utility model relates to a double-operation type straight stroke spring type valve actuator which comprises a barrel body, a hydraulic cylinder fixedly connected to the bottom of the barrel body, an end cover fixed to the top of the barrel body, a spring seat arranged in the barrel body, a connecting seat fixed to the upper end face of the spring seat, a support fixed to the end cover and provided with an inner hole, and a nut arranged in the connecting seat and capable of moving up and down. A screw rod in running fit with the nut is rotatably mounted in an inner hole of the support, a square column capable of manually rotating the screw rod is arranged at the upper end of the screw rod, the upper end of a piston rod of a hydraulic cylinder is fixedly connected with the bottom of a spring seat, a piston of the hydraulic cylinder is connected with a valve, and a compression spring is arranged between the spring seat and the hydraulic cylinder. The connecting seat is fixed on the spring seat, and the screw rod is used for driving the nut, so that when parts in the valve are clamped or the restoring force of the compression spring is not enough to ensure the normal opening and closing of the valve, the valve rod can be forcibly pushed or pulled to the appointed position of the valve to open and close the valve by manually rotating the screw rod; therefore, the valve stroke position control requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of valve control, in particular to a double-operation type straight-stroke spring valve actuator. Background Art

[0002] The valve is a control component in the fluid conveying system, with functions such as cut-off, regulation, diversion, backflow prevention, pressure stabilization, diversion or overflow pressure relief. The adjustment of the valve opening is controlled by the valve actuator.

[0003] The valve actuator is an essential and important part of the automatic control system. Its function is to receive the control signal sent by the controller, change the size of the controlled medium, and thus maintain the controlled variable at the required value or within a certain range.

[0004] For single-acting valve actuators, the handwheel is usually operated by spring force. If the parts inside the valve become stuck or the spring force is insufficient to return the valve to its initial or specified position, the valve actuator will not be able to control the valve to return to its initial or specified position, resulting in the inability to adjust the valve opening to the actual operating requirements. Summary of the invention

[0005] The technical problem to be solved by the utility model is: in order to overcome the deficiencies in the prior art, the utility model provides a double-operation type straight-stroke spring valve actuator which can ensure that the valve accurately returns to an initial or specified position.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a double-operation type straight-stroke spring valve actuator, including a cylinder, a hydraulic cylinder fixedly connected to the bottom of the cylinder, an end cover fixed to the top of the cylinder, a spring seat is arranged in the cylinder, a connecting seat is fixed to the upper end surface of the spring seat, a support with an inner hole is fixed on the end cover, the support extends into the cylinder and the upper part of the support protrudes out of the end cover, a nut that can move up and down is arranged in the connecting seat, a screw rod that cooperates with the screw rod for rotation is rotatably installed in the inner hole of the support, the upper end of the screw rod extending out of the support is provided with a square column for manually rotating the screw rod, the upper end part of the piston rod of the hydraulic cylinder is fixedly connected to the bottom of the spring seat, the piston of the hydraulic cylinder is connected to the valve stem of the valve, and a compression spring is arranged between the spring seat and the hydraulic cylinder.

[0007] Specifically, the hydraulic cylinder has a cylinder body and a flange of an integral structure, the flange is fixed to the bottom surface of the cylinder body, and the piston is slidably matched with the inner wall of the cylinder body and is an integral structure with the piston rod.

[0008] Specifically, the spring seat has a lower inner cavity with an opening facing upward, and the connecting seat has an upper inner cavity with an opening facing downward. The lower inner cavity is connected with the upper inner cavity to form a cavity for the nut to move up and down. The lower end of the nut has a limit block to control the movement of the nut in the cavity.

[0009] Preferably, a regular hexagonal clearance fit is adopted between the outer periphery of the nut and the inner hole of the bottom wall of the inner cavity on the connecting seat.

[0010] Furthermore, the upper periphery of the support has a connecting flange, which is fixedly connected to the end cover, a gland is fixed on the upper end surface of the support, and the square column at the upper end of the screw rod extends out of the gland.

[0011] The beneficial effect of the utility model is that the utility model fixes the connecting seat on the spring seat and adopts a screw rod to drive the nut. When the parts in the valve are stuck or the restoring force of the compression spring is insufficient to ensure the normal opening and closing of the valve, the valve can be opened and closed by manually rotating the screw rod to meet the actual valve position control requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is a schematic diagram of manually opening a valve according to the utility model.

[0015] Figure 3 It is a schematic diagram of the manual closing valve of the utility model.

[0016] Figure 4 It is a schematic diagram of the hydraulic opening valve of the utility model.

[0017] Figure 5 It is a schematic diagram of the utility model compression spring closing valve.

[0018] In the figure: 1. cylinder, 2. hydraulic cylinder, 2-1. piston rod, 2-2. piston, 2-3. cylinder body, 2-4. flange, 3. end cover, 4. spring seat, 5. connecting seat, 6. support, 6-1. connecting flange, 7. nut, 7-1. limit block, 8. screw rod, 8-1. square column, 9. compression spring, 10. cavity, 11. pressure cover. DETAILED DESCRIPTION

[0019] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0020] like Figure 1A dual-operation straight-stroke spring valve actuator is shown, comprising a cylinder 1, a hydraulic cylinder 2 is fixedly connected to the bottom of the cylinder 1, an end cover 3 is fixed to the top of the cylinder 1, the hydraulic cylinder 2 comprises a piston rod 2-1, a piston 2-2, a cylinder body 2-3 and a flange 2-4, the flange 2-4 is fixed to the bottom surface of the cylinder 1, the piston 2-2 is slidably matched with the inner wall of the cylinder body 2-3, and the piston 2-2 and the piston rod 2-1 are an integral structure.

[0021] The cylinder 1 is provided with a spring seat 4, and a connecting seat 5 is fixed to the upper end surface of the spring seat 4. The spring seat 4 has a lower inner cavity with an opening facing upward, and the connecting seat 5 has an upper inner cavity with an opening facing downward. The lower inner cavity is connected with the upper inner cavity to form a cavity 10. The spring seat 4 and the connecting seat 5 after being fixed are matched with the inner wall of the cylinder 1 and can move up and down.

[0022] The support 6 has a lower half extending into the cylinder 1, and an upper half of the support 6 protrudes outside the end cover 3. The support 6 has a connecting flange 6-1 on its upper periphery, and the connecting flange 6-1 is fixedly connected to the end cover 3. A pressure cover 11 is fixed to the upper end surface of the support 6.

[0023] The support 6 has an inner hole, and a nut 7 that can move up and down is provided from the cavity 10 into the inner hole of the support 6. The outer circumference of the nut 7 is a regular hexagon, and a regular hexagonal hole slightly larger than the regular hexagon of the outer circumference of the nut 7 is opened on the bottom wall of the inner cavity on the connecting seat 5, so that the nut 7 can move up and down but cannot rotate relative to the connecting seat 5; the lower end of the nut 7 is provided with a limit block 7-1, and the limit block 7-1 controls the up and down movement range of the nut 7 within the cavity 10.

[0024] A screw rod 8 is rotatably installed in the inner hole of the support 6, and the screw rod 8 is rotatably matched with the nut 7. The upper end of the screw rod 8 extends out of the pressure cover 11, and the upper end of the screw rod 8 extending out of the pressure cover 11 has a square column 8-1 for manually rotating the screw rod 8.

[0025] The upper end of the piston rod 2-1 of the hydraulic cylinder 2 is fixedly connected to the bottom of the lower inner cavity of the spring seat 4 by a spherical nut. The piston 2-2 of the hydraulic cylinder 2 is connected to the valve stem of the valve. A compression spring 9 is provided between the spring seat 4 and the flange 2-4 of the hydraulic cylinder 2.

[0026] Figure 2 The figure shows the manual opening of the valve. The screw rod is manually rotated through the square column. The screw rod rotates clockwise to drive the nut to move downward. The limit block 7-1 of the nut presses on the inner bottom wall of the inner cavity under the spring seat. The screw rod continues to be rotated to push the spring seat downward and compress the compression spring. The downward movement of the spring seat pushes the piston downward to extend its full stroke, pressing down the valve stem.

[0027] Figure 3The figure shows the manual closing of the valve with the compression spring. The screw rod is rotated manually through the square column. The screw rod rotates counterclockwise to drive the nut upward. The limit block 7-1 of the nut is separated from the inner bottom wall of the inner cavity under the spring seat. The compression spring rebounds upward and resets, pushing the spring seat upward, the piston retracts upward, and the valve stem is pulled up. If the valve is stuck and the compression spring reset fails to move the valve stem upward to the specified position, the screw rod can be rotated manually to pull the spring seat upward through the nut and drive the piston to continue to pull the valve stem up.

[0028] Figure 4 The valve is shown to be hydraulically opened, with the manual position in the middle. The piston is pushed downward by filling the cylinder with hydraulic oil, pressing down the valve stem.

[0029] Figure 5 The figure shows the compression spring closing the valve, the manual is in the middle position, the hydraulic pressure is reduced, the compression spring pushes the spring seat upward when it returns upward, the spring seat drives the piston to the initial position, and pulls up the valve stem.

[0030] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A dual-operation linear spring valve actuator, comprising a cylinder (1), a hydraulic cylinder (2) fixedly connected to the bottom of the cylinder (1), and an end cover (3) fixed to the top of the cylinder (1), wherein: A spring seat (4) is provided in the cylinder (1), a connecting seat (5) is fixed on the upper end surface of the spring seat (4), a support (6) with an inner hole is fixed on the end cover (3), the support (6) extends into the cylinder (1) and the upper part of the support (6) protrudes outside the end cover (3), a screw nut (7) that can move up and down is provided in the connecting seat (5), a screw rod (8) that is rotatably installed in the inner hole of the support (6) and is rotatably matched with the screw nut (7), the upper end of the screw rod (8) that extends out of the support (6) has a square column (8-1) that can manually rotate the screw rod (8), the upper end of the piston rod (2-1) of the hydraulic cylinder (2) is fixedly connected to the bottom of the spring seat (4), the piston (2-2) of the hydraulic cylinder (2) is connected to the valve stem of the valve, and a compression spring (9) is provided between the spring seat (4) and the hydraulic cylinder (2).

2. The dual-operation straight-stroke spring-loaded valve actuator according to claim 1, characterized in that: The hydraulic cylinder (2) comprises a cylinder body (2-3) and a flange (2-4) of an integral structure, wherein the flange (2-4) is fixed to the bottom surface of the cylinder body (1), and the piston (2-2) is slidably matched with the inner wall of the cylinder body (2-3) and is an integral structure with the piston rod (2-1).

3. The dual-operation straight-stroke spring valve actuator according to claim 1, characterized in that: The spring seat (4) has a lower inner cavity with an opening facing upward, and the connecting seat (5) has an upper inner cavity with an opening facing downward. The lower inner cavity is connected with the upper inner cavity to form a cavity (10) in which the nut (7) moves up and down. The lower end of the nut (7) has a limit block (7-1) for controlling the nut (7) to move in the cavity (10).

4. The dual-operation straight-stroke spring-loaded valve actuator according to claim 3, characterized in that: A regular hexagonal clearance fit is adopted between the outer periphery of the nut (7) and the inner hole of the bottom wall of the inner cavity on the connecting seat (5).

5. The dual-operation straight-stroke spring-loaded valve actuator according to claim 1, characterized in that: The upper periphery of the support (6) is provided with a connecting flange (6-1), which is fixedly connected to the end cover (3). A pressure cover (11) is fixed to the upper end surface of the support (6), and the square column (8-1) at the upper end of the screw rod (8) extends out of the pressure cover (11).

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